Link and cite version 2 of the NTv3 preprint

Version 2 of the NTv3 preprint is on bioRxiv (posted 2026-10-29). This fills the paper link and the citation that were marked `TBC`. The link is unversioned, so it resolves to the latest version; the BibTeX (key `ntv3`, year 2026) carries the v2 title and authors, checked against the preprint source. The same entry goes into the nucleotide-transformer repo.

README.md

@@ -67,6 +67,7 @@ species' tracks.
 
 ## Links
 
+- 📄 **Paper:** [bioRxiv preprint](https://www.biorxiv.org/content/10.64898/2025.12.22.695963).
 - 📚 **Benchmark dataset:** [`InstaDeepAI/NTv3_benchmark_dataset_revised`](https://huggingface.co/datasets/InstaDeepAI/NTv3_benchmark_dataset_revised),
   the genomes, splits and tracks to reproduce or extend the benchmark.
 - 🧬 **NTv3 tutorials and models:** [`InstaDeepAI/ntv3`](https://huggingface.co/spaces/InstaDeepAI/ntv3).
@@ -74,7 +75,16 @@ species' tracks.
 
 ## Citation
 
-`TBC`, to be added on publication of the NTv3 paper.
+```bibtex
+@article{ntv3,
+  title   = {A multispecies foundation model for genome function prediction, gene annotation and sequence design},
+  author  = {Boshar, Sam and Evans, Benjamin and Tang, Ziqi and Adel, Yanis and Bornachot, Yohan and Sidbon, Shawn and Lorbeer, Franziska K. and Picard, Armand and Rajesh, Chandana and Seitz, Evan and Emms, David and Mendoza-Revilla, Javier and Hernandez, Ariana and Al-Ani, Fatimah and Karch, Tristan and Schiff, Yair and Lopez, Marie and Laterre, Alexandre and Beguir, Karim and Koo, Peter and Kuleshov, Volodymyr and Stark, Alexander and de Almeida, Bernardo P. and Pierrot, Thomas},
+  journal = {bioRxiv},
+  year    = {2026},
+  doi     = {10.64898/2025.12.22.695963},
+  url     = {https://www.biorxiv.org/content/10.64898/2025.12.22.695963}
+}
+```
 
 ## License